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Windows 7: BSOD happens randomly BUT only when additional new ram installed

I consider myself a relatively knowledgeable person whilst dealing with PC's, however this has me stumped, so I hope all the extremely bright people can help me out.

Windows 7 64bit
Retail version, installed about 6 months

I built the computer for my wife, and was awaiting some items to come into stock, so I had only 4gb of ripjaw ram when first installed everything, and everything ran perfectly.

I got my second lot of ram an additional 4gb of ripjaw ram, same model and mhz rating, however once installed BSOD appeared time and time again, I couldn't track down the problem, I ran mem tests, and came back that there was some errors, I took all 4 sticks back and had them replaced, one set was exchanged on the spot the other took about 2 months, so cruising along on 4gb of ram again, and all is well, receive my additional sticks, and within 2 minutes of loging in, BSOD...

The Motherboard has 4 slots, and is compatable with this ram, the slots are colour coded, blue and white (from memory) and the pairs are in the own colours, pair 1 in the blue slots (1 & 3 slots) and pair 2 are in the white slots (2 & 4 slots), once i pull the additional ram out, back to normal.

BSOD happens randomly BUT only when additional new ram installed

Black screen after installed additional 2TB driveHello all
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